If you think you can't do high-intensity interval training, think again.
For the knee osteoarthritis study, the participants doing HIIT started with a seven-minute warm-up, during which they slowly increased the cycling intensity. This was followed by a high-intensity burst, during which they cycled at a cadence up to 110 revolutions per minute (RPM) for 45 seconds. Then they slowed down to about 70 RPMs for 90 seconds. They switched between high intensity and lower intensity a total of five times before a six- to seven-minute cool-down of light to moderate pedaling.